A security guard let two men into a locked McDonald’s and found himself locked in the restroom while the Greenwich Village restaurant was robbed early this morining, police sources said.

Two men in their 20s knocked on the doors of the closed fast-food joint on Varick Street around 4:40 a.m., and asked to use the ATM, s ources added.

The guard let the men inside and one pulled a black and silver revolver, before ordering the unarmed security worker into the bathroom and locking him inside, sources told the Post.

The duo then ordered the rest of the employees to the floor, took about $200 in cash from one of the workers and grabbed about $2,800 from the safe, police sources said.

No arrests have been made. The suspects, who made off with a total of nearly $3,000 are believed to be in their 20s. One wore a green shirt. The other wore a gray sweater.

kconley@nypost.com